MARFLEBARK

“Oh Marflebark!” was uttered by Ezra during Episode 405.
Later that same show, Yappy Fox mentioned “He was marflebarking the whole night” and “He was marflebarked” when describing Kuddlepup after having several drinks.
Poink states that this should be Pee-wee Herman's word of the week.
Later again in the same show, Yappy Fox said “Now that's marflebark!” in response to an inside-out pecker pawpet.

Ever since the funny sounding word gets mentioned on the IRC channel during the shows by various viewers.

According to Kuddlepup, marflebark is just an “expression that one of the locals1) here uses”. There is no known meaning to the word, other than sounding funny.